[CHA-0] Fix QueryReminders to use filter parameter instead of filter_conditions

[nijeesh-stream]

CLA

• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

Changes

• Fixed QueryReminders API call to use filter parameter instead of filter_conditions
• Updated request body formatting for consistency

Why

The API expects the parameter name filter, not filter_conditions. This fix aligns the SDK with the actual API specification.

Testing

• ✅ All existing tests pass
• ✅ Manually verified filters work correctly with production staging credentials
• ✅ Tested message_id, channel_cid, and combined filters